With probability ?
1) a small train at an amusement park is carrying passengers. half of the passengers are 6 years old, 1/10 are 7 years old, 1/5 are 8 years old and 1/5 are 9 years old. what is the expected age for one of the passengers on the train?
a) 6 years
b)7.1 years
c)8 years
d) 8.5 years

2)which probability distribution table corresponds with this frequency table?

x 1 2 3 4 5
f 3 7 2 3 5

a) x 1 2 3 4 5
p 0.3 0.7 0.2 0.3 0.5

b) x 1 2 3 4 5
p 0.2 0.2 0.2 0.2 0.2

c x 1 2 3 4 5
p 0.15 0.35 0.1 0.15 0.25

d) x 1 2 3 4 5
p 1.5 3.5 1 1.5 2.5